python GUI canvas 编写

原创已于 2023-04-07 17:29:53 修改 · 210 阅读

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于 2023-04-07 17:29:03 首次发布

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该代码示例展示了如何使用Python的tkinter库以面向对象的方式创建一个简单的图形用户界面。它包括创建Canvas，绘制直线、矩形、椭圆以及从文件加载图像。此外，还有一个按钮功能，点击后会在Canvas上随机位置绘制多个矩形。

"""使用面向对象的方式写GUI"""
import random

"""Write GUI in an object-oriented manner"""
from tkinter import *

class Application(Frame):

    def __init__(self,master=None):
        super().__init__(master)
        self.master = master
        self.pack()
        self.createWidget()

    def createWidget(self):
        self.canvas = Canvas(self, width=300, height=200, bg="green")
        self.canvas.pack()
        # 画一条直线 Draw a straight line
        line = self.canvas.create_line(10, 10, 30, 20, 40, 50)
        # 画一个矩形 Draw a rectangle
        rect = self.canvas.create_rectangle(50, 50, 100, 100)
        # 画一个椭圆，两对坐标为椭圆的边界矩形左上角和底部右下角
        # Draw an ellipse with two pairs of coordinates for the upper
        # left corner and the lower right corner of the boundary rectangle
        oval = self.canvas.create_oval(50, 50, 100, 100)

        global photo
        photo = PhotoImage(file="image/123.gif")
        self.canvas.create_image(150, 170, image=photo)
        Button(self, text="Draw ten rectangle", command=self.draw50Recg).pack(side="left")

        # 画十个圆的方法
    def draw50Recg(self):
        for i in range(0, 10):
            x1 = random.randrange(int(self.canvas["width"])/2)
            y1 = random.randrange(int(self.canvas["height"])/2)
            x2 = x1 + random.randrange(int(self.canvas["height"])/2)
            y2 = y1 + random.randrange(int(self.canvas["height"])/2)
            self.canvas.create_rectangle(x1, y1, x2, y2)

if __name__ == '__main__':
    root = Tk()
    root.geometry("400x300+200+300")
    app = Application(master=root)
    root.title('Test for canvas')
    root.mainloop()